Ispconfig + FC4 + mail function

Hi to all.
I just installed the ispconfig in a fedore core 4 server following The Perfect Setup - Fedora Core 4 tutorial.

All the operations looks working perfect except the mail() function. In one of my clients i have a formail script. When i try to submit the form i dont take an error message but i never receipt the mail.

Can anyone help me please;

P.S. In the Comment viewing options of The Perfect Setup - Fedora Core 4 tutorial i read the following :

The problem is not with your MTA (Postfix) or any other steps outlined in this HowTo but most probably with FC4's implementation of SELinux which disallows your webserver (Apache?) to use the Postfix sendmail binary (for security reasons). This is a common problem with PHP's mail() function, Apache and SELinux.